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Abstract <p>We report investigation of the reflection of a short, relativistically intense laser pulse from a&#xa0;dense inhomogeneous plasma at oblique incidence, additionally focused by a concave surface formed on the target. Oscillations of the reflecting surface lead to generation of short electromagnetic pulses (attopulses) composed of harmonics of the laser pulse. The degree of focusing of the reflected pulse is determined by the spectrum of the harmonics, the shape and distortions of the reflecting surface, and the curvature of the incident pulse front. For short, few-cycle laser pulses, the intensity of attopulses can increase by up to three orders of magnitude. Longer pulses with tens of optical cycles generate less intense harmonics due to the developing instability, displacement, and modulation of the reflecting surface of the dense plasma.</p>

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Amplification of Attopulses Generated by Relativistic Laser Beams in an Inhomogeneous Dense Plasma

  • 期刊论文

  • 发表日期：

    2025年12月1日

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  • A. A. Andreev,
  • K. Yu. Platonov

摘要

Abstract

We report investigation of the reflection of a short, relativistically intense laser pulse from a dense inhomogeneous plasma at oblique incidence, additionally focused by a concave surface formed on the target. Oscillations of the reflecting surface lead to generation of short electromagnetic pulses (attopulses) composed of harmonics of the laser pulse. The degree of focusing of the reflected pulse is determined by the spectrum of the harmonics, the shape and distortions of the reflecting surface, and the curvature of the incident pulse front. For short, few-cycle laser pulses, the intensity of attopulses can increase by up to three orders of magnitude. Longer pulses with tens of optical cycles generate less intense harmonics due to the developing instability, displacement, and modulation of the reflecting surface of the dense plasma.